混凝土强度影响GFRP板-混凝土组合梁力学性能研究

为研究GFRP板-混凝土组合梁的力学性能,利用ABAQUS有限元软件建立玻璃纤维增强复合材料(GFRP)加固混凝土梁模型,通过组合梁的荷载-跨中挠度曲线和承载力两个方面验证了建立模型方法的合理性。设计了C25、C30和C40三个不同强度等级混凝土的构件模型,分析并得出关于GFRP板-混凝土组合梁的力学性能的结论。结果表明:(1)在相同荷载下,组合梁的极限承载力随着混凝土强度等级增大而增大,延性随着混凝土强度等级增大而减小;(2)增大混凝土强度等级可以有效增大组合梁的极限承载力;(3)GFRP板可以提高组合梁的抗弯承载力;(4)GFRP板-混凝土组合梁主要分为弹性阶段和带裂缝工作两个阶段。

Study on in?uence of concrete strength on mechanical properties of GFRP plate-concrete composite beams

In order to study the mechanical properties of GFRP plate-concrete composite beams, the ABAQUS finite element software was used to establish the concrete beam model reinforced by glass fiber reinforced composites (GFRP). The load-span deflection curve and bearing capacity of composite beams were verified to show the rationality of establishing a model method. The component models of three different strength grades of C25, C30 and C40 were designed, and the conclusions about the mechanical properties of GFRP plate-concrete composite beams were analyzed. Conclusions:(1)The results show that under the same load, the ultimate bearing capacity of the composite beam increases with the increase of concrete strength grade, and the ductility decreases with the increase of concrete strength grade.(2) Increasing the concrete strength grade can effectively increase the ultimate bearing capacity of the composite beam.(3) GFRP panels can improve the flexural capacity of composite beams.(4) GFRP plateconcrete composite beam is mainly divided into two stages:elastic stage and working with crack.